class Worker:
    def __init__(self,framework):
        self.title = '<insert title here>'
        self.framework = framework

    """Returns a tuple containing a string or image object as each item.
    Images will be written to file and an <img> tag will be generated in the html.
    Strings will be placed as-is into the html. Inheriting classes should override
    this."""
    def get_result(self):    
        raise NotImplementedError